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Source: https://outdoors.stackexchange.com/q/22904
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

<p>I'm buying a double sleeping bag for travels with my girlfriend.<br>
Parameters <em>(of the bag, not the girlfriend)</em>: 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.  </p>

<ul>
<li>Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?</li>
<li>Question two: what would be the <em>(approximate)</em> T-comf for such solo sleeping?..</li>
</ul>

<p><hr></p>

<p><strong>NOTE RE: ZIPPABLE BAGS</strong><br>
Yes, I had had thought about them. However, there are a few cons:</p>

<ol>
<li>They have to be Left/Right, i.e. matching. The company that I'm buying my bag from doesn't produce matching sleeping bags.  </li>
<li>I've owned zippable bags and checked out some. All of them had one problem: the zip would stop at the shin level, basically creating two separate spaces for feet. That could be uncomfortable to sleep in (a double mummy-type bag would have a tapered but single feet space).</li>
<li>Two bags are more expensive than a single double bag, and we're talking down which already has a hefty price tag</li>
<li>Two bags (usually) weigh more than a single bag from the same model range</li>
</ol>